673 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Castro Valley: Jazz Heating, Air Conditioning and Plumbing, CR Score 65/100; 4.9★ from 3,438 Google reviews; open 24/7.
Best for emergencies (open 24/7): Chill Heating and Cooling, posts 24/7 hours; ranked #2 of 673.
Most-reviewed: Service Champions, 5,220 Google reviews at 4.9★, the most of 673 ranked; ranked #6.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
673 Castro Valley HVAC contractors are ranked here by CR Score, from ten published factors. 188 are open 24/7, 431 open Saturdays and 347 open Sundays, based on posted hours. The median Google rating is 4.9★ across 673 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Jazz Heating, Air Conditioning and Plumbing | 65 | 4.9★ (3,438) | Pleasanton, 12 mi away | 24/7 | Overall |
| 2 | Chill Heating and Cooling | 64 | 5.0★ (1,017) | San Ramon, 8 mi away | 24/7 | Emergencies |
| 3 | Service Champions | 64 | 4.9★ (4,721) | Livermore, 16 mi away | 24/7 | — |
| 4 | Service Champions | 64 | 4.8★ (2,337) | Pleasanton, 9 mi away | 24/7 | — |
| 5 | Bell Brothers Plumbing Heating & Air - Hayward | 63 | 4.7★ (863) | Hayward, 5 mi away | 24/7 | — |
| 6 | Service Champions | 63 | 4.9★ (5,220) | Martinez, 22 mi away | 24/7 | Most reviews |
| 7 | Albert Nahman Plumbing, Heating, and Cooling | 63 | 4.7★ (3,311) | Berkeley, 15 mi away | 24/7 | — |
| 8 | Service Hero Plumbing & Air | 63 | 4.5★ (1,252) | Hayward, 4 mi away | 24/7 | — |
| 9 | Comfy Heating & Air Conditioning | 62 | 4.9★ (602) | Danville, 11 mi away | 24/7 | — |
| 10 | Heating And Air Experts - Affordable HVAC Contractor in Fremont, California | 62 | 5.0★ (761) | Fremont, 14 mi away | 24/7 | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 in Castro Valley
Based in Pleasanton, 12 mi away
Ranked #1 because of its Google rating and trade focus: 4.9★ from 3,438 Google reviews, listed on Google as “HVAC contractor”.
Based in San Ramon, 8 mi away
Ranked #2 because of its Google rating and trade focus: 5.0★ from 1,017 Google reviews, listed on Google as “HVAC contractor”.
Based in Livermore, 16 mi away
Ranked #3 because of its Google rating and trade focus: 4.9★ from 4,721 Google reviews, listed on Google as “HVAC contractor”.
Based in Pleasanton, 9 mi away
Ranked #4 because of its Google rating and trade focus: 4.8★ from 2,337 Google reviews, listed on Google as “HVAC contractor”.
Based in Hayward, 5 mi away
Ranked #5 because of its Google rating and trade focus: 4.7★ from 863 Google reviews, listed on Google as “HVAC contractor”.
Based in Martinez, 22 mi away
Ranked #6 because of its Google rating and review volume: 4.9★ from 5,220 Google reviews, the most in Castro Valley.
Based in Berkeley, 15 mi away
Ranked #7 because of its Google rating and trade focus: 4.7★ from 3,311 Google reviews, listed on Google as “HVAC contractor”.
Based in Hayward, 4 mi away
Ranked #8 because of its Google rating and trade focus: 4.5★ from 1,252 Google reviews, listed on Google as “HVAC contractor”.
Based in Danville, 11 mi away
Ranked #9 because of its Google rating and trade focus: 4.9★ from 602 Google reviews, listed on Google as “HVAC contractor”.
Based in Fremont, 14 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 761 Google reviews, listed on Google as “HVAC contractor”.
Based in San Lorenzo, 2 mi away
Ranked #11 because of its Google rating and trade focus: 4.7★ from 265 Google reviews, listed on Google as “HVAC contractor”.
Based in Hayward, 4 mi away
Ranked #12 because of its Google rating and trade focus: 4.9★ from 162 Google reviews, listed on Google as “HVAC contractor”.
Based in Hayward, 4 mi away
Ranked #13 because of its Google rating and trade focus: 4.6★ from 474 Google reviews, listed on Google as “HVAC contractor”.
Based in San Jose, 23 mi away
Ranked #14 because of its Google rating and trade focus: 4.9★ from 3,407 Google reviews, listed on Google as “HVAC contractor”.
Based in Hayward, 5 mi away
Ranked #15 because of its Google rating and trade focus: 4.9★ from 172 Google reviews, listed on Google as “HVAC contractor”.
Based in Alameda, 3 mi away
Ranked #16 because of its Google rating and trade focus: 4.9★ from 130 Google reviews, listed on Google as “HVAC contractor”.
Based in Concord, 22 mi away
Ranked #17 because of its Google rating and trade focus: 4.9★ from 2,463 Google reviews, listed on Google as “HVAC contractor”.
Based in Hayward, 5 mi away
Ranked #18 because of its Google rating and trade focus: 4.5★ from 700 Google reviews, listed on Google as “HVAC contractor”.
Based in Fremont, 15 mi away
Ranked #19 because of its Google rating and trade focus: 4.9★ from 723 Google reviews, listed on Google as “HVAC contractor”.
Based in Concord, 18 mi away
Ranked #20 because of its Google rating and trade focus: 4.9★ from 1,255 Google reviews, listed on Google as “HVAC contractor”.
Based in San Francisco, 20 mi away
Ranked #21 because of its Google rating and trade focus: 4.9★ from 1,454 Google reviews, listed on Google as “HVAC contractor”.
Based in San Francisco, 18 mi away
Ranked #22 because of its Google rating and trade focus: 4.9★ from 966 Google reviews, listed on Google as “HVAC contractor”.
Based in Walnut Creek, 17 mi away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 481 Google reviews, listed on Google as “HVAC contractor”.
Based in San Francisco, 17 mi away
Ranked #24 because of its Google rating and trade focus: 4.9★ from 1,876 Google reviews, listed on Google as “HVAC contractor”.
Based in Livermore, 19 mi away
Ranked #25 because of its Google rating and trade focus: 4.9★ from 920 Google reviews, listed on Google as “HVAC contractor”.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 673 ranked HVAC contractors here; the rest are on their profiles.
20 more HVAC contractors within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| AC Repair Danville | 5.0★ (2) | 10 mi |
| Atlas Trillo | 4.6★ (1,308) | 23 mi |
| Attaboy Hvac Llc | 5.0★ (1) | In Castro Valley |
| Automatic Control Engineering | 4.5★ (2) | 3 mi |
| Bryant Heating & Cooling Systems | In Castro Valley | |
| California HVAC | 4.9★ (59) | 10 mi |
| Commercial Filter Services | 3.0★ (2) | 6 mi |
| Daikin Applied Service | 5.0★ (1) | In Castro Valley |
| E-fficient HVAC | 5.0★ (2) | 8 mi |
| Furnace / AC repair service. Commercial refrigeration, HVAC | 5.0★ (2) | 10 mi |
| Glover & Son Heating & Air Inc | 3.0★ (2) | 8 mi |
| Hayward duct cleaning & dryer solution | 5.0★ (2) | 4 mi |
| Insulation & Air Duct Crew | 5.0★ (2) | 3 mi |
| LEET Kitchen & Bathroom Remodeling | 5.0★ (2) | 9 mi |
| Liberty Blue HVAC LLC | In Castro Valley | |
| Panda Heating & Cooling | 3.5★ (2) | 6 mi |
| RJA Group LLC | 3.0★ (2) | 1 mi |
| Same Day Air Conditioning & Heating | 4.7★ (550) | 22 mi |
| Smart Heating and Air Conditioning | 4.9★ (324) | 21 mi |
| Sugar Bear Home Services | 4.9★ (369) | 18 mi |
National price ranges in USD, not adjusted for Castro Valley. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| AC replacement | $3,887 | $5,978 | $8,073 | Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range | October 2026 |
| Furnace replacement | $2,823 | $4,814 | $6,896 | Per system, installed; typical range of customer-reported jobs. US national range | October 2026 |
In California, Contractors State License Board (CSLB) licenses C-20 Warm-Air Heating, Ventilating and Air-Conditioning contractor license.
Jobs of $1,000 or more in labor and materials (from January 1, 2025).
No chip usually means we have not matched a state record yet. Check the lookup yourself before you hire.
Guide checked October 2026. How we verify licenses
California's HVAC demand peaks during summer heat waves and the first cold snaps. Spring and fall are the easiest times to book maintenance.
We scored 673 Castro Valley HVAC contractors on ten factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Castro Valley data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |